best available cop



BEST AVAILABLE COP (No Model.) 2 Sheets-Sheet 1. B. Le COULTRE. Chronographs.

No. 230,787. Patented Aug. 3,1880.

WITNESSES INVENTOR ATTORNEYS.

nPEIERs, PMoro-LITHDGRAPNER. WASHIMGTO I.) c.

BEST AVAILABLE COP UNITED STATES PATENT FHQEQ CH RONOGRAPH.

SPECIFICATION formingpart of Letters Patent 1\ T0. 230,787, dated August 3, 1880.

Application filed May 31, 1880. (N0 model.)

To all whom it may concern:

Be it known thatLBnNJAivrrN Ln GoUL'rnE, of Geneva, Switzerland, have invented a new and useful Improvement in Ghronographs, of which the following is a specification.

The object of my invention, is to construct achronograph having both second and minute hands indicating by one dial and mounted on the same arbor. I fit upon the central arbor of the watch a loosesleeve that carries the minute-hand and adriving-wheel, and outside of this I fit a second loose sleeve carrying the second -hand and a driving-wheel. Upon a lever fitted for movement by a ratchet-wheel in the usual manner are fitted the wheels that operate the second-hand from the center pinion when moved into gear, and upon a pivoted arm that is connected with the lever is a pinion that connects a fixed pinion on the center arbor with the driving-wheel of the minute-hand. The driving-wheels of both the second and minute hands are fitted with hearteams that are fitted for being acted upon by a T-arm to bring both hands back to the starting-point. By this construction a simultaneous action is obtained on both handsfirst, to set them in motion; second, to arrest them and, third, to return them to the starting-point.

The construction and operation will be described in detail with reference to the accompanying drawings, wherein- Figure 1 is a face view of a chronograph with my improved mechanism, the dial being removed to show the parts more clearly. Fi

2 is a cross-section on line 00 as, showing the coimectin'g-pinions for the second-hand. Fig. 3 is a similar section on line 3 y, showing the connecting-pinion of the minute-hand.

Similar letters of reference indicate corresponding parts.

The barrel, trains of gearing therefrom to the center pinion and escapement-wheel, and the escapement-wheel are omitted from the drawings, as they will be of usual character.

a is the center arbor, carrying the pinions I) and c and receiving its movement by the small pinion d. e is a loose sleeve on arbor a, carrying at its inner end the wheel or pinion f and at its outer end the minute-hand g. It is a sleeve loose upon sleeve 6, and carrying at its outer end the second-hand i, and at its inner end the steel wheel or pinion it above wheel f, which wheel is formed with two hundred and forty teeth. Zis the dial-plate of the watch, the dial being similar to those of second chronographs. on is a .bridge formed with a bearing for the sleeve It, and n is a plate carrying the mechanism.

Upon the face of plate a a lever, o, is hung by a pin, 0, which lever at one end extends above the side of a ratchet-wheel, p, that is carried by a stud in plate a, while the other end'of lever 0 extends contiguous to the cen tral arbor, and has fitted in its slotted end a short arbor which carries the pinions q 1'.

Upon the plate a is also hung, by a pin, 5*, an arm, 8, which is fitted with a pinion, t, in its outer forked end, and engages, by a pin, 1', with the end of lever 0. p and q are springs bearing, respectively, on lever o and arm .s' to force them toward the center arbor, and thereby engage the pinion t with the pinions of andpinion q with pinion k.

t is a lever hun g on plate a, carrying a pawl, t that engages with ratchet p, and titted for movement by a push-pin, u, in the usual manner, to turn wheel 1) the distance of one tooth at every depression of the pin. The side of: ratchet-wheel p is formed with lugs, that come in succession in contact with lever o to move said lever and the arm 5 away from the center arbor. There is one of these lugs to every third ratchet-tooth,and they act in successi onfirst, upon arms 4; e, that extend between the pinions 70 f, to throw said arms outward; sec ond, upon the spring-arms w to, that carry brakes bearing on pinions hf, to relieve the brakes from the pinions; and, third, on the lever 0. The arms 22 ware thrown inward by springs when relieved.

Upon the inner adjacent sides of the pinions 7; f are attached heart-cams lrf, and the r ends of the arms 12 are formed to bear on said and. By this construction itwvill be seen that both the minute and second hands are upon and driven from the central arbor, and both indicate by a common dial.

In operation, both hands being at the startingpoint, the first pressure on the pin moves i the pinions q 26 into gear and raises the arms '0 10, so that the hands are turned. The next movement of the pin throws the pinions qt out of gear and moves the brake-arms 10 upon the pinions 71: 1', thereby stopping the hands. The third inovement relieves the arms '0, so that they are pressed upon the cams is f and the hands brought back to the starting-point.

Having thus described myinvention, Iclaim as new and desire to secure by Letters Patcut- 1. In chronographs, the loose sleeve e and BEST AVAILABLE co BENJAMIN LE OOULTRE.

i tn esses:

J. E. MONTGOMERY, J. SAVAGE DELAVAN.

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